[Alan Anderson]

Yeah, no resistor is necessary.

You said you declared them as Digital Inputs. Did you then have them connected to Digital Inputs on the Digital Sidecar? Only the signal wire should be used; the power and ground come from a 20A circuit on the Power Distribution board.

If you didn't connect them to the proper pins (e.g. miswiring them to the Digital Sidecar ground instead of signal), you wouldn't have been able to read their state. A disconnected Digital Input always reads as true.